Finding the Fourth Proportional to 8,819.72, 12,171.30 and 4,840.91

Step by Step Solution

1. Step 1: Write the proportion equation
   8,819.72 : 12,171.30 = 4,840.91 : x
2. Step 2: Convert to fraction form
   8,819.72/12,171.30 = 4,840.91/x
3. Step 3: Cross multiply
   8,819.72x = 12,171.30 × 4,840.91
4. Step 4: Simplify right side
   8,819.72x = 58,920,167.88
5. Step 5: Solve for x
   x = 58,920,167.88/8,819.72
6. Step 6: Final answer
   x = 6,680.50